Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 3, Pages 3205-3218Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3111003
Keywords
Boost full bridge (BFB); electric vehicle (EV) battery chargers; high frequency-link; LLC resonant converter; phase modular; phase shift pulsewidth-modulation (PS-PWM); pulse frequency modulation (PFM); single-stage frequency conversion; zero current soft switching (ZCS); zero voltage soft switching (ZVS)
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Funding
- Japan Society for the Promotion of Science [18H01428]
- Grants-in-Aid for Scientific Research [18H01428] Funding Source: KAKEN
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This study presents a new single-stage high frequency-link three-phase LLC converter with soft switching commutation for a wide range of load power adjustment. The load power and voltage can be regulated by pulse frequency modulation and phase-shift pulsewidth-modulation.
A new single-stage high frequency-link three-phase LLC ac-dc converter is proposed in this article. The proposed converter is featured by a boost full-bridge topology-based phase module with power factor correction (PFC) for the three-phase utility frequency ac to single-phase high-frequency ac conversion without a smoothed dc link, which brings the simplicity, cost-effectiveness, excellent modularity, and high efficiency into the power supply. The soft switching commutation can achieve over the wide range of load power with the assist of magnetizing current of a high frequency transformer in the LLC topology. The load power and voltage can be regulated by pulse frequency modulation and phase-shift pulsewidth-modulation depending on the load conditions. The effectiveness of the proposed converter is investigated by simulation and experiment of a 2 kW-50 kHz preliminary prototype, thereby the single-stage frequency conversion, PFC and zero voltage soft-switching are revealed from a practical point of view.
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